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Simplifying 3 = 3b + 21 Reorder the terms: 3 = 21 + 3b Solving 3 = 21 + 3b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-3b' to each side of the equation. 3 + -3b = 21 + 3b + -3b Combine like terms: 3b + -3b = 0 3 + -3b = 21 + 0 3 + -3b = 21 Add '-3' to each side of the equation. 3 + -3 + -3b = 21 + -3 Combine like terms: 3 + -3 = 0 0 + -3b = 21 + -3 -3b = 21 + -3 Combine like terms: 21 + -3 = 18 -3b = 18 Divide each side by '-3'. b = -6 Simplifying b = -6
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